Variable: Barrel insert
diameter as labled. As a base for comparison, the velocities from
a one piece CCM barrel were also recorded. Velocity was not adjusted
between inserts, in order to overall velocity increase or decrease as affected
by barrel fit.

Chronograph strings:
Each string represents two groups of 10 shots fired at 1 second intervals
under microprocessor control - paintgun secured on test stand.

High: This represents the highest velocity
in the recorded string of shots.Low: This represents the lowest velocity
in the recorded string of shots.E.S.: Extreme Spread - this is the
difference in velocity between the highest velocity shot and the lowest
velocity shot.Ave: Average - this is the average
velocity of the string of shots. This is the number to look at to
compare whether velocity is increased overall, or decreased overall by
a change in a variable.S.D.: Standard Deviation - S.D. Is
a mathematicall way of expressing how close most of the shots are to the
average. The lower the Standard Deviation is, the more consistent
the velocity is.95%: This is an easier to understand
way of expressing consistency. Statistically, there is a 95% chance
than a given shot will vary this amount in velocity.